In early December of the ninth year of Xuande's reign, the concubine Ouyang Xuan gave birth to a son, who was born with a vision of nine-colored clouds and bright stars. Taizong was very happy and named him "Jiuhua". The son of Concubine Jing, the ninth son of Emperor Taizong, also named Zixiao. In March of the 24th year of the election, Taizong was critically ill and wanted to establish Jiuhua as the crown prince. At that time, the eldest prince, Qin Yuan, the chief steward, usurped the imperial edict and wanted to assassinate Jiuhua in the palace. However, Jiuhua disappeared and Taizong heard that he was seriously ill. On March 20, the 24th year of the election, Taizong died in Yong'an Hall and was posthumously named "Emperor Xuanwu". In June, the eldest prince ascended the throne, and the country was named "Jian'an". ————"Guoyu. Xuan Dynasty Book"